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2 天前 · Hydrogen peroxide (H 2 O 2) is a nonplanar molecule with (twisted) C 2 symmetry; this was first shown by Paul-Antoine Giguère in 1950 using infrared spectroscopy.Although the O−O bond is a single bond, the molecule has a relatively high rotational barrier of 386 cm −1 (4.62 kJ/mol) for rotation between enantiomers via the trans configuration, and 2460 cm −1 (29.4 kJ/mol) via the cis ...
- H₂O₂
- 34.014 g·mol−1
- −0.43 °C (31.23 °F; 272.72 K)
- Miscible
2 天前 · CRISPR (/ˈkrɪspər/) (an acronym for clustered regularly interspaced short palindromic repeats) is a family of DNA sequences found in the genomes of prokaryotic organisms such as bacteria and archaea.[2] These sequences are derived from DNA fragments of bacteriophages that had previously infected the prokaryote. They are used to detect and ...
- CRISPR
- Escherichia coli
1 天前 · Oxytocin is a peptide hormone and neuropeptide normally produced in the hypothalamus and released by the posterior pituitary.[4] Present in animals since early stages of evolution, in humans it plays roles in behavior that include social bonding, love, reproduction, childbirth, and the period after childbirth.[5][6][7][8] Oxytocin is released ...
2 天前 · Photosynthesis ( / ˌfoʊtəˈsɪnθəsɪs / FOH-tə-SINTH-ə-sis) [1] is a system of biological processes by which photosynthetic organisms, such as most plants, algae, and cyanobacteria, convert light energy, typically from sunlight, into the chemical energy necessary to fuel their activities.
2 天前 · The Navier–Stokes equations ( / nævˈjeɪ stoʊks / nav-YAY STOHKS) are partial differential equations which describe the motion of viscous fluid substances. They were named after French engineer and physicist Claude-Louis Navier and the Irish physicist and mathematician George Gabriel Stokes. They were developed over several decades of ...
14 小時前 · Iranian politicians killed in the 2024 Varzaqan helicopter crash: [35] Mohammad Ali Ale-Hashem, 61, representative of the Supreme Leader in East Azerbaijan (since 2017) Hossein Amir-Abdollahian, 60, minister of foreign affairs (since 2021), ambassador to Bahrain (2007–2010) Malek Rahmati, 41–42, governor-general of East Azerbaijan (since 2024)
2 天前 · t. e. The Cambodian genocide [a] was the systematic persecution and killing of Cambodian citizens [b] by the Khmer Rouge under the leadership of Prime Minister of Democratic Kampuchea, Pol Pot. It resulted in the deaths of 1.5 to 2 million people from 1975 to 1979, nearly 25% of Cambodia's population in 1975 ( c. 7.8 million).
